SEAL (Simple Encrypted Arithmetic Library) is an easy-to-use homomorphic encryption library, developed by researchers in the Cryptography Research group at Microsoft Research. SEAL is written in standard C++17 and contains .NET Framework wrappers for the public API. SEAL is licensed under the Microsoft Research License Agreement and is free for research use (see LICENSE.txt).

Since SEAL has no external dependencies and is written in standard C++17 it is easy to build on any 64-bit system. For building in Windows, SEAL contains a Visual Studio 2017 solution file. For building in Linux and Mac OS X, SEAL requires either g++-6 or newer, or clang++-5 or newer. Please see INSTALL.txt for installation instructions using CMake.

The code-base contains examples written both in C++ and in C#. These examples are heavily commented, serving as a self-contained short introduction to using SEAL. In addition, the .h files both in the C++ library and in the .NET wrapper library contain detailed comments for the public API.

To learn to use SEAL, we recommend looking at the example projects, as they contain several detailed and thoroughly commented examples demonstrating most of the basic features.

We would like to thank John Wernsing, Michael Naehrig, Nathan Dowlin, Rachel Player, Gizem Cetin, Susan Xia, Peter Rindal, Kyoohyung Han, Zhicong Huang, and Amir Jalali for their contributions to the SEAL project. We would also like to thank everyone who has sent us helpful comments, suggestions, and bug reports.

If you have any questions, suggestions, comments, or bug reports, please contact us by emailing sealcrypto@microsoft.com.